What’s Included?

The RTZ lowering kit includes:

• 2-inch front lowering coil springs
• 4-inch rear hanger kit
• 4-inch rear shackle kit
• Premium DoetschTech Nitro Slammer shocks
• Installation hardware

This complete approach helps eliminate the guesswork often associated with building a lowering setup from multiple manufacturers.

2-Inch Front Drop Coil Springs

The included front lowering springs are engineered to reduce ride height by approximately 2 inches.

Benefits include:

• Reduced wheel gap
• Improved front-end appearance
• Lower center of gravity
• Better weight transfer control

Unlike cut springs—a modification that should stay in the early 2000s where frosted tips and flip phones belong—proper lowering springs are engineered to maintain predictable handling and ride quality.

Note: PLEASE INSPECT PARTS BEFORE BEGINNING INSTALLATION. WE SUGGEST A PROFESSIONAL INSTALLER WITH PROPER EQUIPMENT TO HANDLE EXTREME LOADS AND THAT HAS TRAINING IN SUSPENSION SAFETY.

High-Tensile Alloy Steel Construction

RTZ manufactures these springs using high-strength alloy steel designed to withstand years of daily use.

Key construction features include:

Heat-Treated Design

Heat setting helps:

• Reduce spring fatigue
• Maintain ride height consistency
• Improve long-term durability

Load Testing

Each spring is tested to meet:

• Proper load specifications
• Intended spring rates
• Suspension performance standards

This process helps ensure consistent performance and minimizes the risk of premature sagging.

4-Inch Rear Hanger and Shackle Lowering Kit

The rear portion of the kit lowers the truck approximately 4 inches using replacement hangers and shackles.

Advantages include:

• More level stance
• Improved appearance
• Better rear suspension geometry than some budget alternatives
• Maintained leaf spring function

The 2/4 drop combination has become one of the most popular lowering setups for GMT800 trucks because it dramatically improves appearance while remaining practical for street use.

DoetschTech Nitro Slammer Shocks

One of the biggest advantages of this package is the inclusion of performance shocks.

Many lowering kits reuse factory shocks that may already have thousands of miles of wear.

The included DoetschTech Nitro Slammer shocks feature:

• Nitrogen gas charging
• Improved damping control
• Better ride quality
• Enhanced cornering stability
• Reduced suspension oscillation

Quality shocks are critical for maintaining comfort and handling after lowering.

Limited Life-Time Warranty & Made in the us
Heat Set & Shot Peened to Save you Spring Fatigue
Load Tested for Right kind “Sport” Spring Rate which is 15% higher than OEM
Powder-coated to Save you Corrosion

Vehicle Fitment

This RTZ lowering kit is designed for:

Chevrolet Silverado 1500 2WD

• 1999 Chevrolet Silverado 1500
• 2000 Chevrolet Silverado 1500
• 2001 Chevrolet Silverado 1500
• 2002 Chevrolet Silverado 1500
• 2003 Chevrolet Silverado 1500
• 2004 Chevrolet Silverado 1500
• 2005 Chevrolet Silverado 1500
• 2006 Chevrolet Silverado 1500

GMC Sierra 1500 2WD

• 1999 GMC Sierra 1500
• 2000 GMC Sierra 1500
• 2001 GMC Sierra 1500
• 2002 GMC Sierra 1500
• 2003 GMC Sierra 1500
• 2004 GMC Sierra 1500
• 2005 GMC Sierra 1500
• 2006 GMC Sierra 1500

Note: This kit is intended for 2WD V6 applications. Verify vehicle compatibility before ordering.

Handling Improvements

Lowering a Silverado or Sierra can improve more than appearance.

Benefits often include:

Reduced Body Roll

A lower center of gravity helps minimize excessive leaning during cornering.

Improved Stability

Drivers frequently notice improved confidence during highway driving.

Better Steering Feel

The truck feels more connected to the road, particularly during lane changes and sweeping turns.

Enhanced Weight Distribution

Lower ride height can help improve chassis balance under acceleration and braking.

Ride Quality Expectations

Because this kit includes properly matched shocks and lowering springs, ride quality remains surprisingly comfortable.

Drivers should expect:

• Slightly firmer ride
• Better body control
• Reduced suspension float
• Improved responsiveness

The truck will feel sportier without becoming harsh or uncomfortable for everyday driving.

Installation Considerations

Before installing a lowering kit, inspect:

• Ball joints
• Tie rods
• Control arm bushings
• Leaf spring bushings
• Wheel bearings

Many GMT800 trucks now have over two decades of service, making suspension inspection a smart investment.

Following installation:

• Perform a complete alignment
• Verify pinion angle if necessary
• Re-torque all suspension hardware
• Inspect brake line clearance

Professional installation is recommended for owners unfamiliar with suspension modifications.

Why a 2/4 Drop Is So Popular

Among Silverado and Sierra owners, the 2/4 drop remains one of the most balanced suspension setups available.

It offers:

• Aggressive street-truck appearance
• Improved handling
• Good ride quality
• Daily-driver practicality
• Minimal clearance issues

For most owners, it’s the sweet spot between factory ride height and a full custom lowered build.

Final Thoughts

The RTZ 2-Inch Front and 4-Inch Rear Lowering Kit with DoetschTech Nitro Slammer Shocks provides a complete suspension solution for 1999-2006 Chevrolet Silverado and GMC Sierra 1500 2WD trucks. By combining engineered lowering springs, rear hangers and shackles, and performance shocks, this kit delivers improved stance, handling, and ride quality in a single package.

If you’re looking to eliminate wheel gap, sharpen handling, and give your GMT800 truck a cleaner street-truck profile without sacrificing drivability, this RTZ kit offers a well-rounded suspension upgrade that checks all the right boxes.